/**
	Pulsar engine. Core.
	Additional string functions

	Copyright (C) 2013-2014 Dmitry Dolgov

	This program is free software; you can redistribute it and/or modify it under the terms of the
	GNU General Public License as published by the Free Software Foundation; either version 2 of
	the License, or (at your option) any later version.

	This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
	without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
	See the GNU General Public License for more details.
*/

#include <pulsar/pulsar.h>
#include <pulsar/src/pulsar_intr.h>

namespace pl
{

static pl_uint32 _crcTable[256] =
{
	0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3,
	0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91,
	0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
	0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5,
	0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172, 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B,
	0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
	0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F,
	0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, 0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D,
	0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
	0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01,
	0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, 0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457,
	0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
	0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB,
	0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0, 0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9,
	0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
	0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD,
	0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, 0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683,
	0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
	0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7,
	0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5,
	0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
	0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79,
	0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, 0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F,
	0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
	0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713,
	0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21,
	0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
	0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45,
	0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2, 0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB,
	0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
	0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF,
	0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94, 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D
};

// Convert signed int to string
template<typename T> pl_char* _intToStr(pl_char* dest, T value, T radix)
{
	if (value < 0)
	{
		value = -value;
		*dest++ = PL_T('-');
	}

	pl_char* first = dest;
	while (value >= radix)
	{
		T div = value / radix;
		T c = value - div * radix;
		*dest++ = static_cast<pl_char>(c + (c >= 10 ? (PL_T('A') - 10) : PL_T('0')));
		value = div;
	}
	*dest++ = static_cast<pl_char>(value + (value >= 10 ? (PL_T('A') - 10) : PL_T('0')));
	reverseString(first, dest);

	return dest;
}

// Convert unsigned int to string
template<typename T> pl_char* _uintToStr(pl_char* dest, T value, T radix)
{
	pl_char* first = dest;
	while (value >= radix)
	{
		T div = value / radix;
		T c = value - div * radix;
		*dest++ = static_cast<pl_char>(c + (c >= 10 ? (PL_T('A') - 10) : PL_T('0')));
		value = div;
	}
	*dest++ = static_cast<pl_char>(value + (value >= 10 ? (PL_T('A') - 10) : PL_T('0')));
	reverseString(first, dest);

	return dest;
}

// Convert floating point to string
pl_char* _floatToStr(pl_char* dest, float value, int precision = 6)
{
	if (value < 0)
	{
		value = fabs(value);
		*dest++ = '-';
	}

	// separate fraction and integer part
	float frac = modff(value, &value);

	// integer part
	dest = _intToStr(dest, static_cast<long long>(value), (long long)(10));

	// fraction part
	if (frac != 0)
	{
		*dest++ = '.';
		for (; precision > 0; precision--)
		{
			frac *= 10;
			unsigned int digit = static_cast<unsigned int>(frac);
			*dest++ = static_cast<pl_char>(digit + '0');
			frac -= digit;
		}
	}

	return dest;
}

// Convert double floating point to string
pl_char* _floatToStr(pl_char* dest, double value, int precision = 6)
{
	if (value < 0)
	{
		value = fabs(value);
		*dest++ = '-';
	}

	// separate fraction and integer part
	double frac = modf(value, &value);

	// integer part
	dest = _intToStr(dest, static_cast<long long>(value), (long long)(10));

	// fraction part
	if (frac != 0)
	{
		*dest++ = '.';
		for (; precision > 0; precision--)
		{
			frac *= 10;
			unsigned int digit = static_cast<unsigned int>(frac);
			*dest++ = static_cast<pl_char>(digit + '0');
			frac -= digit;
		}
	}

	return dest;
}

pl_char* _floatToStr(pl_char* dest, long double value, int precision = 6)
{
	return _floatToStr(dest, static_cast<double>(value), precision);
}

inline short _getSign(const pl_char*& first)
{
	short sign = 1;

	if (*first == '-')
	{
		sign = -1;
		++first;
	}
	else if (*first == '+')
	{
		++first;
	}
	return sign;
}

// Convert from string to int
template<typename T> T _strToInt(const pl_char* first, const pl_char** endChar, int radix)
{
	if (first == NULL)
	{
		PL_ASSERTW(false, PL_T("Wrong arguments"));
		return (T)0;
	}


	if (radix == -1)
	{
		radix = 10;

		// Detect auto
		if (*first == PL_T('0'))
		{
			radix = 8;
			if (pl_toupper(first[1]) == 'X')
			{
				if (!pl_isxdigit(*first))
				{
					// String like 0xP - only first zero will be translated
					radix = 10;
				}
				else
				{
					radix = 16;
					first += 2;
				}
			}
		}
	}

	T result = 0;

	for (; *first != '\0'; ++first)
	{
		switch (radix)
		{
			case 8:
				if (!(*first >= '0' && *first <= '7'))
				{
					goto exit;
				}
				result = static_cast<T>(radix * result + (*first - '0'));
				break;
			case 10:
				if (!pl_isdigit(*first))
				{
					goto exit;
				}
				result = static_cast<T>(radix * result + (*first - '0'));
				break;
			case 16:
				if (!pl_isxdigit(*first))
				{
					goto exit;
				}
				pl_char c = static_cast<pl_char>(pl_toupper(*first));
				result = static_cast<T>(radix * result + (c >= 'A' ? c - 'A' + 10 : c - '0'));
				break;
		}
	}
exit:
	if (endChar != NULL)
	{
		*endChar = first;
	}
	return result;
}

// Convert from string to floating point
template<typename T> T _strToFloat(const pl_char *first, const pl_char** endChar)
{
	// sign
	short sign = 1;

	if (*first == '-')
	{
		sign = -1;
		++first;
	}
	else if (*first == '+')
	{
		++first;
	}

	// integer part
	T result = 0;
	for (; pl_isdigit(*first); ++first)
	{
		result = 10 * result + (*first - '0');
	}

	// fraction part
	T frac = 0;
	if (*first == '.')
	{
		++first;

		T inv_base = 1;
		for (; pl_isdigit(*first); ++first)
		{
			inv_base *= T(0.1);
			frac += (*first - '0') * inv_base;
		}
	}

	// result w\o exponent
	result = (result + frac) * sign;

	// exponent
	bool exponent_negative = false;
	int exponent = 0;
	const pl_char* posBeforeExp = first;

	if (*first == 'e' || *first == 'E')
	{
		++first;

		if (*first == '-')
		{
			exponent_negative = true;
			++first;
		}
		else if (*first == '+')
		{
			++first;
		}

		if (!pl_isdigit(*first))
		{
			// Bad exp
			first = posBeforeExp;
			goto end_process;
		}

		for (; pl_isdigit(*first); ++first)
		{
			exponent = 10 * exponent + (*first - '0');
		}
	}

	if (exponent)
	{
		T power_of_ten = 10;
		for (; exponent > 1; exponent--)
		{
			power_of_ten *= 10;
		}

		if (exponent_negative)
		{
			power_of_ten = T(1) / power_of_ten;
		}

		result *= power_of_ten;
	}
end_process:

	if (endChar != NULL)
	{
		*endChar = first;
	}

	return result;
}

} // namespace pl

pl_char* pl::_num2str(pl_char* dest, short value, int radix)
{
	return _intToStr(dest, value, static_cast<short>(radix));
}

pl_char* pl::_num2str(pl_char* dest, unsigned short value, int radix)
{
	return _uintToStr(dest, value, static_cast<unsigned short>(radix));
}

pl_char* pl::_num2str(pl_char* dest, char value, int radix)
{
	return _intToStr(dest, value, static_cast<char>(radix));
}

pl_char* pl::_num2str(pl_char* dest, unsigned char value, int radix)
{
	return _uintToStr(dest, value, static_cast<unsigned char>(radix));
}

pl_char* pl::_num2str(pl_char* dest, int value, int radix)
{
	return _intToStr(dest, value, static_cast<int>(radix));
}

pl_char* pl::_num2str(pl_char* dest, unsigned int value, int radix)
{
	return _uintToStr(dest, value, static_cast<unsigned int>(radix));
}

pl_char* pl::_num2str(pl_char* dest, long value, int radix)
{
	return _intToStr(dest, value, static_cast<long>(radix));
}

pl_char* pl::_num2str(pl_char* dest, unsigned long value, int radix)
{
	return _uintToStr(dest, value, static_cast<unsigned long>(radix));
}

pl_char* pl::_num2str(pl_char* dest, long long value, int radix)
{
	return _intToStr(dest, value, static_cast<long long>(radix));
}

pl_char* pl::_num2str(pl_char* dest, unsigned long long value, int radix)
{
	return _uintToStr(dest, value, static_cast<unsigned long long>(radix));
}

pl_char* pl::_num2str(pl_char* dest, float value)
{
	return _floatToStr(dest, value);
}

pl_char* pl::_num2str(pl_char* dest, double value)
{
	return _floatToStr(dest, value);
}

pl_char* pl::_num2str(pl_char* dest, long double value)
{
	return _floatToStr(dest, value);
}

void pl::_str2num(const pl_char *first, char& value, const pl_char** endChar /*= NULL*/, int radix /*= -1*/)
{
	short sign = _getSign(first);
	value = (char)sign*_strToInt<char>(first, endChar, radix);
}

void pl::_str2num(const pl_char *first, unsigned char& value, const pl_char** endChar /*= NULL*/, int radix /*= -1*/)
{
	short sign = _getSign(first);
	value = (char)sign*_strToInt<unsigned char>(first, endChar, radix);
}

void pl::_str2num(const pl_char *first, short& value, const pl_char** endChar /*= NULL*/, int radix /*= -1*/)
{
	short sign = _getSign(first);
	value = sign*_strToInt<short>(first, endChar, radix);
}

void pl::_str2num(const pl_char *first, unsigned short& value, const pl_char** endChar /*= NULL*/, int radix /*= -1*/)
{
	value = _strToInt<unsigned short>(first, endChar, radix);
}

void pl::_str2num(const pl_char *first, int& value, const pl_char** endChar /*= NULL*/, int radix /*= -1*/)
{
	short sign = _getSign(first);
	value = sign*_strToInt<int>(first, endChar, radix);
}

void pl::_str2num(const pl_char *first, unsigned int& value, const pl_char** endChar /*= NULL*/, int radix /*= -1*/)
{
	value = _strToInt<unsigned int>(first, endChar, radix);
}

void pl::_str2num(const pl_char *first, long& value, const pl_char** endChar /*= NULL*/, int radix /*= -1*/)
{
	short sign = _getSign(first);
	value = sign*_strToInt<long>(first, endChar, radix);
}

void pl::_str2num(const pl_char *first, unsigned long& value, const pl_char** endChar /*= NULL*/, int radix /*= -1*/)
{
	value = _strToInt<unsigned long>(first, endChar, radix);
}

void pl::_str2num(const pl_char *first, long long& value, const pl_char** endChar /*= NULL*/, int radix /*= -1*/)
{
	short sign = _getSign(first);
	value = sign*_strToInt<long long>(first, endChar, radix);
}

void pl::_str2num(const pl_char *first, unsigned long long& value, const pl_char** endChar /*= NULL*/, int radix /*= -1*/)
{
	value = _strToInt<unsigned long long>(first, endChar, radix);
}

void pl::_str2num(const pl_char *first, float& value, const pl_char** endChar /*= NULL*/, int radix /*= -1*/)
{
	value = _strToFloat<float>(first, endChar);
}

void pl::_str2num(const pl_char *first, double& value, const pl_char** endChar /*= NULL*/, int radix /*= -1*/)
{
	value = _strToFloat<double>(first, endChar);
}

void pl::_str2num(const pl_char *first, long double& value, const pl_char** endChar /*= NULL*/, int radix /*= -1*/)
{
	value = _strToFloat<long double>(first, endChar);
}

bool pl::wildCompare(const pl_char* wild, const pl_char* str)
{
	const pl_char* w = wild;
	const pl_char* s = str;

	while (*str != 0 || *wild == '*')
	{
		if (*wild == '*')
		{
			while (*wild == '*')
			{
				++wild;
			}
			if (*wild == 0)
			{
				return true;
			}

			w = wild;
			s = str;
		}
		else if (*wild == *str || *wild == '?')
		{
			++wild;
			++str;
		}
		else
		{
			wild = w;
			str = ++s;
		}
	}

	return *wild == 0;
}

/*
*/
pl_uint32 pl::bufferChecksum(const void *buffer, pl_uint32 size)
{
	pl_uint32 result = 0xFFFFFFFF;

	if (buffer == NULL)
	{
		PL_ASSERTW(false, PL_T("Wrong arguments"));
		return 0;
	}

	pl_uint8* p = (pl_uint8*)buffer;
	while (size--)
	{
		result = _crcTable[(result ^ (*p)) & 0xFF] ^ (result >> 8);
		p++;
	}
	return ~result;
}

/*
*/
pl_uint32 pl::stringChecksum(const pl_char *buffer, pl_uint32 size)
{
	pl_uint32 result = 0xFFFFFFFF;

	if (buffer == NULL)
	{
		PL_ASSERTW(false, PL_T("Wrong arguments"));
		return 0;
	}

	while (size--)
	{
		result = _crcTable[(result ^ (*buffer)) & 0xFF] ^ (result >> 8);
		buffer++;
	}
	return ~result;
}

/*
*/
pl_uint32 pl::stringChecksum(const pl_char* str)
{
	return stringChecksum(str, pl_strlen(str));
}

/**
	Reverse characters between first & last
*/
void pl::reverseString(pl_char *first, pl_char *last)
{
	PL_ASSERTE(first != NULL, PL_T("Bad arguments"));
	PL_ASSERTE(last != NULL, PL_T("Bad arguments"));
	PL_ASSERTE(first <= last, PL_T("Bad arguments"));

	for (; first < last; ++first)
	{
		pl_char temp = *first;
		*first = *--last;
		*last = temp;
	}
	return;
}

//
// End of file 'pulsar_string_util.cpp'
//
